Found in a 90’s Radio Electronics, this circuit uses a component from the time, difficult to find today. It generates 12 tones in different octaves.
This circuit with an integrated circuit of the time was found in the magazine Radio Electronics of April...
This circuit was found in a 90s Popular Electronics. It uses an LS3404 melody chip that has...
This circuit was found in Radio Electronics magazine from August 1966. The transistors are from...